radius |
%
light |
%
mass |
age |
metal
abundance |
rotation speed |
|
halo |
100
kpc |
0 |
95 |
11
- 13 Gyr |
poor -4 < dex < -3 |
negligible |
thick
disk |
2
kpc |
2 |
0.2 |
10
- 11/12 Gyr |
intermediate -2.2 < dex < -0.5 |
170
km/s |
thin
disk |
0.6
kpc |
90 |
5 |
1
- 10/11 Gyr |
rich -0.5 < dex < 0.3 |
220
km/s |
extreme
disk (star formation) |
0.2
kpc |
7 |
<
1 |
<
1 Gyr |
very
rich dex < 1.0 |
220
km/s |
bulge (bar-shaped?) |
1 |
<1 |
8
- 13.6 Gyr |
|||
black
hole |
0 |
0 |
13.6
Gyr ?? |